1 /*- 2 * Copyright (c) 2003 Silicon Graphics International Corp. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions, and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * substantially similar to the "NO WARRANTY" disclaimer below 13 * ("Disclaimer") and any redistribution must be conditioned upon 14 * including a substantially similar Disclaimer requirement for further 15 * binary redistribution. 16 * 17 * NO WARRANTY 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGES. 29 * 30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $ 31 */ 32 /* 33 * CTL backend driver registration routines 34 * 35 * Author: Ken Merry <ken@FreeBSD.org> 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/types.h> 45 #include <sys/malloc.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/condvar.h> 49 #include <sys/queue.h> 50 #include <sys/sysctl.h> 51 52 #include <cam/scsi/scsi_all.h> 53 #include <cam/scsi/scsi_da.h> 54 #include <cam/ctl/ctl_io.h> 55 #include <cam/ctl/ctl.h> 56 #include <cam/ctl/ctl_frontend.h> 57 #include <cam/ctl/ctl_backend.h> 58 #include <cam/ctl/ctl_frontend_internal.h> 59 #include <cam/ctl/ctl_ioctl.h> 60 #include <cam/ctl/ctl_ha.h> 61 #include <cam/ctl/ctl_private.h> 62 #include <cam/ctl/ctl_debug.h> 63 64 extern struct ctl_softc *control_softc; 65 66 int 67 ctl_backend_register(struct ctl_backend_driver *be) 68 { 69 struct ctl_softc *ctl_softc; 70 struct ctl_backend_driver *be_tmp; 71 72 ctl_softc = control_softc; 73 74 mtx_lock(&ctl_softc->ctl_lock); 75 /* 76 * Sanity check, make sure this isn't a duplicate registration. 77 */ 78 STAILQ_FOREACH(be_tmp, &ctl_softc->be_list, links) { 79 if (strcmp(be_tmp->name, be->name) == 0) { 80 mtx_unlock(&ctl_softc->ctl_lock); 81 return (-1); 82 } 83 } 84 mtx_unlock(&ctl_softc->ctl_lock); 85 86 /* 87 * Call the backend's initialization routine. 88 */ 89 be->init(); 90 91 mtx_lock(&ctl_softc->ctl_lock); 92 93 STAILQ_INSERT_TAIL(&ctl_softc->be_list, be, links); 94 95 ctl_softc->num_backends++; 96 97 /* 98 * Don't want to increment the usage count for internal consumers, 99 * we won't be able to unload otherwise. 100 */ 101 /* XXX KDM find a substitute for this? */ 102 #if 0 103 if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0) 104 MOD_INC_USE_COUNT; 105 #endif 106 107 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED 108 be->config_move_done = ctl_config_move_done; 109 #endif 110 /* XXX KDM fix this! */ 111 be->num_luns = 0; 112 #if 0 113 atomic_set(&be->num_luns, 0); 114 #endif 115 116 mtx_unlock(&ctl_softc->ctl_lock); 117 118 return (0); 119 } 120 121 int 122 ctl_backend_deregister(struct ctl_backend_driver *be) 123 { 124 struct ctl_softc *ctl_softc; 125 126 ctl_softc = control_softc; 127 128 mtx_lock(&ctl_softc->ctl_lock); 129 130 #if 0 131 if (atomic_read(&be->num_luns) != 0) { 132 #endif 133 /* XXX KDM fix this! */ 134 if (be->num_luns != 0) { 135 mtx_unlock(&ctl_softc->ctl_lock); 136 return (-1); 137 } 138 139 STAILQ_REMOVE(&ctl_softc->be_list, be, ctl_backend_driver, links); 140 141 ctl_softc->num_backends--; 142 143 /* XXX KDM find a substitute for this? */ 144 #if 0 145 if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0) 146 MOD_DEC_USE_COUNT; 147 #endif 148 149 mtx_unlock(&ctl_softc->ctl_lock); 150 151 return (0); 152 } 153 154 struct ctl_backend_driver * 155 ctl_backend_find(char *backend_name) 156 { 157 struct ctl_softc *ctl_softc; 158 struct ctl_backend_driver *be_tmp; 159 160 ctl_softc = control_softc; 161 162 mtx_lock(&ctl_softc->ctl_lock); 163 164 STAILQ_FOREACH(be_tmp, &ctl_softc->be_list, links) { 165 if (strcmp(be_tmp->name, backend_name) == 0) { 166 mtx_unlock(&ctl_softc->ctl_lock); 167 return (be_tmp); 168 } 169 } 170 171 mtx_unlock(&ctl_softc->ctl_lock); 172 173 return (NULL); 174 } 175 176 /* 177 * vim: ts=8 178 */ 179